DATA RELEVANT INFORMATION MANAGEMENT DEVICE, DATA COMMUNICATION SYSTEM, DATA RELEVANT INFORMATION MANAGEMENT METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To enable the determination of whether metadata of data can be deleted in a system that stores the metadata of the data and location information of the data and has a data retrieval mechanism.SOLUTION: A data relevant information management device includes a data relevant information storage part for storing data relevant information obtained by associating data identification information with metadata of data shown by the data identification information, a data relevant information management part for managing the data relevant information stored in the data relevant information storage part, and a subordinate data information storage part for storing subordinate data information obtained by associating node identification information showing a node of a communication network with data identification information of data subordinate to the node. The data relevant information management part determines whether the data identification information is included in the subordinate data information about the data identification information included in the data relevant information, and deletes the data identification information and the associated metadata from the data relevant information when determining that the data identification information is not included.